This monograph for Sodium Carbonate Monohydrate provides, in addition to common physical constants, a general description including typical appearance, applications, change in state (approximate), and aqueous solubility. The monograph also details the following specifications and corresponding tests for verifying that a substance meets ACS Reagent Grade specifications including: Assay, Loss on Drying, Insoluble Matter, Chloride, Phosphate, Silica, Sulfur Compounds, Heavy Metals, Iron, Calcium, Magnesium, and Potassium.